I was working on my infection map and I finished it now when I made the gametype I made it so zombies instantly kill humans. The Alpha Zombie is invulnerable, now the description of "instant killing" is that it kills anyone even though they are invulnerable now when I played the game I put a custom power up that made it so a human could kill the alpha zombie by giving the human the ability of instant kill and is invulnerable so only the alpha zombie can kill him. So when I tried to play it players with invulnerable on are NOT killed by those who had instant kill so what's up with up? Also when I put a sentinal beam on the map (Blackout) it doesn't appear on custom games.
Your post was somewhat confusing, but I think I got the gist of it. In the sense of Invulnerability and Instant Kill, Instant Kill is basically (in the language of game programing) producing the maximum amount of damage that can be delivered. So say if someones health is at 100, and Instant Kill does say, 1000 damage, that will instantly wipe out the health points of that person. However, when you set health to Invulnerability, it takes the health points and sets them to infinity, so they can't be killed that way, except assassination. To my knowledge, assassination is just an object hit command that results in instant death, hence why it does not change with invulnerability. So, in short, Instant Kill does the maximum amount of damage, and Invulnerability has not set amount of health, so that is why it is not affected. As for the sentinel beam, check in your game settings first. If you have it so non map default weapons are set, then that is why it won't show up. However, if that isn't the case, go into forge and check it's properties. It can either be set not to spawn at start, or set to asymmetric/symmetric only. Hope that helps.